Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Voltammetric Determination of Dopamine in a Mixture of Dopamine and Ascorbic Acid at a Deactivated Polythiophene Film Modified Electrode
Zhiqiang GAODavid YAPYimin ZHANG
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1998 年 14 巻 6 号 p. 1059-1063

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抄録
The voltammetric responses of dopamine (DA) and ascorbic acid (AA) at a deactivated polythiophene (PT) film modified electrode were investigated. It was found that DA displays nearly identical voltammetric response at both a bare and the modified electrode, while the voltammetric signal of AA is greatly suppressed at the modified electrode due to the repul-sion between it and the deactivated film. Various experimental parameters affecting the voltammetric responses of DA and AA were studied. The modified electrode was demonstrated to be very useful in selectively determining DA in a mixture of DA and AA. At a 0.5 μm deactivated PT film modified electrode the calibration curve of DA was linear over the range of 0.8 μM - 1.0 mM in the presence of 1.0 mM AA. The detection limit was 0.4 μM.
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© 1998 by The Japan Society for Analytical Chemistry
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